What does it mean when a guy says bye to you?

[rosey123]

Ok this might sound really stupid but what does it mean when a guy says bye to you randomly because I have a crush on this guy and he knows who I am but we don't really talk to each other and today he said bye to me and I said bye back, what does this mean? I'm sorry if this question is stupid

[Iamaguy4real]

That he's moving on because he has options.